Dr. Tim's Re-Fresh (Freshwater)Keeps surfaces clean Maintains water clarity Re Fresh revitalizes old, green brown aquarium water. It is a potent combination of beneficial bacteria that work together to maintain clear water, clean aquarium surfaces and eliminate unpleasant odors. Because the condition of every aquarium varies, it may be necessary to add Re Fresh more frequently (every other day) to achieve desired results. Directions: Shake well before using. Dosage: Add 5 ml per 10